20011901 has 8 divisors (see below), whose sum is σ = 24630144. Its totient is φ = 15833520.

The previous prime is 20011841. The next prime is 20011913. The reversal of 20011901 is 10911002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20011901 - 2¹⁰ = 20010877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109865 + ... + 110046.

It is an arithmetic number, because the mean of its divisors is an integer number (3078768).

Almost surely, 2^20011901 is an apocalyptic number.

It is an amenable number.

20011901 is a deficient number, since it is larger than the sum of its proper divisors (4618243).

20011901 is a wasteful number, since it uses less digits than its factorization.

20011901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219931.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 20011901 is about 4473.4663293692. The cubic root of 20011901 is about 271.4955914572.

Adding to 20011901 its reverse (10911002), we get a palindrome (30922903).

The spelling of 20011901 in words is "twenty million, eleven thousand, nine hundred one".